141 



som Furer ere spikelholdige. Polypkroppen 3 mm lang, dens 

 bagré Del smal, cylindrisk; dens forreste Del udvider sig 

 traktformigt imod Tentakelskiven og er forsynet med 8 

 Ribber, imellem hvilke et lignende Antal smale Furer. 

 Tentaklerne omtrent 2 mm lange, rige paa Spikier ; Pinnulerne 

 have ogsaa Spilder. Paa Basaldelen ere Dobbeltstjerner, 

 Spindler og Klubber hyppigst. Paa Polypcellerne ere elliptiske 

 Spindler og paa Polyperne større og mindre Spindler, samt 

 Køller almindeligst. Svælgrøret har 8 Spikelrækker. Farven 

 gul, spillende i det Brune. 



Sympodium abyssorum, n. sp. 



Tab. XXIII. 



Zoanthodemet er uden Stamme. Basaldelen er fast, 

 membranøs og indkapsler ganske i omtrent 150 mm 's Længde 

 den 200""" lange Stilk af Bathycrinus Carpenteri, Dan. 

 & Kor., Fig. 1. Selve Roden med dens Forgreninger er 

 omspændt af Basalmembranen, Fig. 1, a. Fra denne reiser 

 Polyperne med deres Celler sig dels i Grupper, dels enkelt- 

 vis, Fig. 1. Hvor Polypgrupperne tindes, er Basalmem- 

 branen flere Millimeter tyk, imedens den forøvrigt er tynd, 

 ikke synderligt over l mm i Tykkelse. I Grupperne sidde 

 Polyperne meget tæt sammen og ligne Drueklaser, og hyp- 

 pigt ere Cellerne lige ved Grunden samnienvoxecle. 



Polypcellerne ere fuldstændigt retraktile, eylindriske, 

 5 — Qmm l ari g e g forsynede med 8 stærke Længderibber, 

 dannede af paatversliggende Spilder, og ligesaamange Furer, 

 der synes at være nøgne, Fig. 2, a. Hvor Cellen gaar 

 over i Polypkroppen, blive Ribberne mindre fremtrædende 

 og naar den er noget indtrukken, fremstaar paa dens Rand 

 8 Tænder, der kun antyde de inclbøiede Ribber foroven ; 

 Fig. 2, &; er Cellen ganske indtrukken, danner den enten 

 en skarp, tyk Rand omkring Polypen, eller naar denne 

 ogsaa er indtrukken, lukker Cellen sig ganske og danner 

 da en liden, halvkuglerund Ophøining i Form af en Stjerne, 

 i hvis Midte sees en yderst liden, rund Aabning. Naar 

 saaledes en hel Gruppe af Polyper med deres Celler ere 

 indtrukne, tabes Drueformen, og den ligner da en Samling 

 af stjerneformede Halvkugler, Fig. 1, b. 



Polyperne ere eylindriske, retraktile, 6"™ lange; paa 

 deres Bagkrop, nærmest Cellen, sees kun svage Ribber, hvor 

 Spikier ligge endnu paatvers, Fig. 2, c, men noget mere 

 fremover træde Ribberne stærkere frem, saa at Forkroppen 

 har 8 Ribber, hvori Spiklerne ligge paalangs; imellem 



furrows between them. Both, the ribs and the furrows, 

 contain spicules. The polyp-body measures 3 mm in length; 

 its posterior part is narrow and cylindrical ; its anterior part 

 becomes dilated, in infundibuliform, in the neighbourhood of 

 the tentacular disk, and is furnished with 8 ribs, between 

 which there are a similar number of narrow furrows. The 

 tentacles measure about 2 mm in length, and are rich in spi- 

 cules. The pinnules have, also, spicules. On the basal 

 part, bistellates, fusees, and clavates, are the most frequent 

 forms. On the polyp-cells, elliptic fusees, and on the polyps, 

 larger and smaller fusees, and subclavates, are the most 

 frequent spicular forms. The gullet-tube has 8 spicular 

 series. Colour yellow, shading towards brown. 



Sympodium abyssorum, n. sp. 



Pl. XXIII. 



The Zoanthodem has no stem. The basal part is 

 hard and membranaceous, and it completely encloses, for 

 about 150""" of its length, the 200"™ long stalk of Bathy- 

 crinus Carpenteri, Dan. & Kor. (fig. 1). The root itself, 

 with its branches, is encompassed by the basal membrane 

 (fig. 1, a). From the membrane, the polyps with their cells, 

 stand up, partly in groups, and partly singly (fig. 1). 

 Where the polyp-groups occur, the basal membrane is 

 several millimetres in thickness, but, otherwise, it is thin, 

 being not much in excess of l mm in thickness. In the 

 groups, the polyps are placed very closely together and 

 resemble clusters of grapes, and, frequently, the cells are 

 concreted together close to the base. 



The polyp-cells are completely retractile; they are 

 cylindrical, and measure 5 — 6"™ in length; they are fur- 

 nished with 8, strong, longitudinal ribs, formed of spicules 

 placed trans versally, and a similar number of furrows which 

 appear to be bare (fig. 2 ? a). At the point where the cell 

 passes over into the polyp-body, the ribs become less pro- 

 minent, and when the polyp is somewhat retracted 8 teeth 

 appear upon its margin, but these solely indicate the curv- 

 ing inwards of the ribs above (fig. 2, b). When the cell is 

 quite retracted it forms, either, a sharp thick margin around 

 the polyp, or when the polyp, also, is retracted, the cell 

 completely shuts itself, and then forms a semi-globular 

 prominence in the form of a star, in whose middle an ex- 

 tremely minute circular aperture is observed. When an 

 entire group of polyps with their cells are thus retracted 

 the racemous form disappears, and it then resembles a 

 collection of stelliform semi-spheres (fig. 1, b). 



The polyps are cylindrical and retractile, and mea- 

 sure 6 mm in length; on their posterior body, nearest to 

 the cell, faint ribs only are observed, whose spicules are 

 still placed transversally (fig. 2, c), but a little further for- 

 ward the ribs become more prominent, so that the anterior 



